python父类方法是否会调用子类重写方法测试

class a():
    def a1(self):
        print(self.a2())
    def a2(self):
        return 'a-a2'

class aa(a):
    def a2(self):
        return 'aa-a2'

c = aa()
c.a1()   # 输出aa-a2